feat(pushNotifications): added anonymous token for push notifications

lib/core/firebase_api.dart

@@ -26,6 +26,22 @@ class FirebaseApi {
     return token;
   }
 
+  Future<void> registerAnonymousPushToken() async {
+    try {
+      final deviceInfo = DeviceInfoPlugin();
+      await sl<Dio>().post(
+        '/api/anonymous_token',
+        data: {
+          'platform': Platform.isIOS ? 'ios' : 'android',
+          'hw_id': Platform.isIOS ? (await deviceInfo.iosInfo).identifierForVendor : (await deviceInfo.androidInfo).id,
+          'token': await getToken(),
+        },
+      );
+    } catch (e, st) {
+      log(e.toString(), stackTrace: st);
+    }
+  }
+
   Future<void> registerPushToken() async {
     if (await TokenStorage.haveTokenInStorage()) {
       try {